By singular, I think you're referring to the fact that he was teamed with Claremont on X-Men, right?

As for Giffen, solo, he wrote Justice League International/of America in the late 80's through the very early 90's. That's probably his best known singular work. He worked with Paul Levitz on Legion of Super-Heroes, notably on the "Great Darkness Saga" storyline, viewed as that title's best arc. He teamed with John Rodgers for the first few issues of Blue Beetle, which was highly acclaimed. He also wrote the Annihilation mini-series for Marvel, as well as the Annihilation Conquest: Star Lord mini-series, which featured Star Lord/Peter Quill, Rocket Racoon, and Groot coming together for the first time.

Yes mostly as pencillers. Byrne's only singular well known work as writer was Fantastic Four. I'm drawing a blank on Giffen in regards to writing though.

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I know others have already said this, but I need to repeat it. Giffen teamed up to write the best Justice League era in the history of the group, the JL International/Europe/America era with JM DeMatteis. Byrne, besides writing a great FF and an almost definitive Superman, started and wrote a good deal of Sensational She-Hulk, which was amazing. Jerry Ordway wrote THE BEST Captain Marvel series in the character's 75+ year history, The Power of Shazam.

So, really, some of the best comics for some of my favorite characters (including my favorite DC hero, Captain Marvel, and favorite Marvel hero, She-Hulk) were written by artists. That doesn't mean that a lot of artists shouldn't write (I wouldn't read anything JRjr wrote, and Liefeld is barely an artist, much less a writer), but a few have done it very, very well.

I'd like to add Frank Miller to the list. His recent work might be completely insane, but he did a re-imagination of Daredevil that is now considered the definitive version, his work on Batman in the 80s was fantastic (I may think it's often overrated, but it is still fantastic, not to mention influential), his original work on stuff like Ronin, Sin City and Big Guy & Rusty ...

Kirby wrote. In fact, according to Kirby, he wrote more of the work that bared his and Stan Lee's name than Stan did:

[LEFT]GROTH:When you went to Marvel in ’58 and ’59, Stan was obviously there.[/LEFT]
[LEFT]KIRBY: Yes, and he was the same way.

[/LEFT]
[LEFT]GROTH:And you two collaborated on all the monster stories?[/LEFT]
[LEFT]KIRBY: Stan Lee and I never collaborated on anything! I’ve never seen Stan Lee write anything. I used to write the stories just like I always did.

[/LEFT]
[LEFT]GROTH:On all the monster stories it says “Stan Lee and Jack Kirby.” What did he do to warrant his name being on them?[/LEFT]
[LEFT]KIRBY: Nothing! OK?

[/LEFT]
[LEFT]GROTH:Did he dialogue them?[/LEFT]
[LEFT]KIRBY: No, I dialogued them. If Stan Lee ever got a thing dialogued, he would get it from someone working in the office. I would write out the whole story on the back of every page. I would write the dialogue on the back or a description of what was going on. Then Stan Lee would hand them to some guy and he would write in the dialogue. In this way Stan Lee made more pay than he did as an editor. This is the way Stan Lee became the writer. Besides collecting the editor’s pay, he collected writer’s pay. I’m not saying Stan Lee had a bad business head on. I think he took advantage of whoever was working for him.

Kirby wrote. In fact, according to Kirby, he wrote more of the work that bared his and Stan Lee's name than Stan did:

[LEFT]GROTH:When you went to Marvel in ’58 and ’59, Stan was obviously there.[/LEFT]
[LEFT]KIRBY: Yes, and he was the same way.

[/LEFT]
[LEFT]GROTH:And you two collaborated on all the monster stories?[/LEFT]
[LEFT]KIRBY: Stan Lee and I never collaborated on anything! I’ve never seen Stan Lee write anything. I used to write the stories just like I always did.

[/LEFT]
[LEFT]GROTH:On all the monster stories it says “Stan Lee and Jack Kirby.” What did he do to warrant his name being on them?[/LEFT]
[LEFT]KIRBY: Nothing! OK?

[/LEFT]
[LEFT]GROTH:Did he dialogue them?[/LEFT]
[LEFT]KIRBY: No, I dialogued them. If Stan Lee ever got a thing dialogued, he would get it from someone working in the office. I would write out the whole story on the back of every page. I would write the dialogue on the back or a description of what was going on. Then Stan Lee would hand them to some guy and he would write in the dialogue. In this way Stan Lee made more pay than he did as an editor. This is the way Stan Lee became the writer. Besides collecting the editor’s pay, he collected writer’s pay. I’m not saying Stan Lee had a bad business head on. I think he took advantage of who even was working for him.

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[/LEFT]

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Jack was pretty bitter at that point. While I don't doubt Kirby heavily contributed to the plotting and suggested dialogue, Stan's style was pretty unique and different than from Kirby's as anyone reading his solo work can attest. Certain ticks are evident whether it's the FF, Thor or Spider-man. If he did use ghosts they were very constistant.